H_Fisher writes: "In a letter to Congress, Kazuo Hirai, chairman of Sony's board of directors, blames hacker group Anonymous for making possible the theft of gamers' personal information. "What is becoming more and more evident is that Sony has been the victim of a very carefully planned, very professional, highly sophisticated criminal cyber attack designed to steal personal and credit card information for illegal purposes," Hirai wrote. He also indicated that Sony waited two days before notifying the FBI of the theft."